IPA: /ˈstɪfənər/
KK: /ˈstɪfənər/
An item or material that is added to something to make it more rigid or firm, like a support beam or starch used in clothing.
The tailor used a stiffener to keep the collar of the shirt looking sharp.
Stiffener → It is formed from "stiff" (from Old English "stif", meaning firm or rigid) and "-ener" (a suffix used to indicate a person or thing that performs a specific action). The word "stiffener" refers to something that makes another object more firm or rigid.
Think of something that makes an object more 'firm' or 'rigid' — that's what a stiffener does.